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  <title>拷贝文件</title>
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 <body class="docs"><div id="layout">
  <div id="layout-content"><div id="function.copy" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">copy</h1>
  <p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">copy</span> &mdash; <span class="dc-title">拷贝文件</span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.copy-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>copy</strong></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$source</code></span>
   , <span class="methodparam"><span class="type">string</span> <code class="parameter">$dest</code></span>
   [, <span class="methodparam"><span class="type">resource</span> <code class="parameter">$context</code></span>
  ] ) : <span class="type">bool</span></div>

  <p class="para rdfs-comment">
   将文件从 <code class="parameter">source</code> 拷贝到 <code class="parameter">dest</code>。
  </p>
  <p class="para">
   如果要移动文件的话，请使用 <span class="function"><a href="rename.html" class="function">rename()</a></span> 函数。
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.copy-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<code class="parameter">source</code></dt>

     <dd>

      <p class="para">
       源文件路径。
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">dest</code></dt>

     <dd>

      <p class="para">
       目标路径。如果 <code class="parameter">dest</code> 是一个 URL，则如果封装协议不支持覆盖已有的文件时拷贝操作会失败。
      </p>
      <div class="warning"><strong class="warning">Warning</strong>
       <p class="para">
       如果目标文件已存在，将会被覆盖。
       </p>
      </div>
     </dd>

    
    
     <dt>
<code class="parameter">context</code></dt>

     <dd>

      <p class="para">
       A valid context resource created with 
       <span class="function"><a href="stream_context_create.html" class="function">stream_context_create()</a></span>.
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.copy-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <strong><code>FALSE</code></strong>。
  </p>
 </div>


 <div class="refsect1 changelog" id="refsect1-function.copy-changelog">
  <h3 class="title">更新日志</h3>
  <p class="para">
   <table class="doctable informaltable">
    
     <thead>
      <tr>
       <th>版本</th>
       <th>说明</th>
      </tr>

     </thead>

     <tbody class="tbody">
      <tr>
       <td>5.3.0</td>
       <td>
        增加了对 context 的支持。
       </td>
      </tr>

      <tr>
       <td>4.3.0</td>
       <td>
        如果启用了“fopen wrappers”的话，<code class="parameter">source</code> 和
    <code class="parameter">dest</code> 都可以是 URL。更多细节见 <span class="function"><a href="fopen.html" class="function">fopen()</a></span>。
       </td>
      </tr>

     </tbody>
    
   </table>

  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-function.copy-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-2765">
    <p><strong>Example #1 <span class="function"><strong>copy()</strong></span> 例子</strong></p>
    <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$file&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">'example.txt'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$newfile&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">'example.txt.bak'</span><span style="color: #007700">;<br /><br />if&nbsp;(!</span><span style="color: #0000BB">copy</span><span style="color: #007700">(</span><span style="color: #0000BB">$file</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$newfile</span><span style="color: #007700">))&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"failed&nbsp;to&nbsp;copy&nbsp;</span><span style="color: #0000BB">$file</span><span style="color: #DD0000">...\n"</span><span style="color: #007700">;<br />}<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
    </div>

   </div>
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.copy-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="move_uploaded_file.html" class="function" rel="rdfs-seeAlso">move_uploaded_file()</a> - 将上传的文件移动到新位置</span></li>
    <li class="member"><span class="function"><a href="rename.html" class="function" rel="rdfs-seeAlso">rename()</a> - 重命名一个文件或目录</span></li>
    <li class="member">The section of the manual about <a href="features.file_upload.html" class="link">handling file uploads</a></li>
   </ul>
  </p>
 </div>

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